Is monogamy a bad thing?

I’ve come across this article on ‘polyamory’, that reports on the work of Terri Conley from Michigan University (she was quoted by another jelly on another thread).

The article argues that monogamy tends to be bad for your social life, and unatural. It takes a lot of self-control / self-castration. On the other hand, polyamorous relationships seem pretty complex to maintain and make work over the long term. There is also a strong social stigma against them. In fact Terri Conley struggled to get her research published due what she felt was a pervasive bias in favour of monogamy.

What do you guys and gals think?